A retailer marks his products at 25% more than the cost price. If a customer receives a discount of 20%, what is the profit percentage for the retailer?

Average weight of 18 students is 54 kg. After including a new student in that group the average weight rises by 1 kg. What is the weight of the new student?

The traffic lights at three different crossings change after 30 seconds, 40 seconds, and 60 seconds respectively. Then in 30 min how many times will they change simultaneously?

Sahil bought toffees at 12 for a rupee. How many toffees for a rupee he should sell to gain 20%?

$M$ can do a piece of work in $\frac{39}{2}$ days and N in $\frac{13}{2}$ days. How many days will both take together to complete the work?

P got 20 per cent less marks than Q. R got 20 per cent less marks than Q. If R got 160 marks, then what are the marks of P?

What will be the average of all the odd numbers between 8 and 28?

Rahul earns an interest of 2996 for the third year and 1400 for the second year on the same sum. Find the rate of interest per annum if it is lent at compound interest (compounding annually).

If a certain sum of money becomes double of itself in 8 years 6 months at simple interest, then what will be the annual rate of interest?

What is the Highest Common Factor of 4/11 and 16/33?

If the side of a square is increased by 5 per cent, then what will be the percentage increase in its perimeter?

In an alloy of 240 gram copper and iron are in the ratio of 7 5. How much quantity of iron should be added so that the ratio of copper and iron become 7: 13?

If selling price of an article is ₹ 2800 and Marked price is ₹ 4000. What is the discount percentage?

Find the length of the plank which can be used to measure exactly the lengths 6 m 50 cm, 3 m 50 cm and 7 m 50 cm in the least time.

If a: b = 4: 5 and b : c = 3: 8, then find a: b: с.